You Say Your Tank Is A 55 Gallon I Used Your Dimension,s On Fish And Tips.com.......... 48 By 16 By 24 And It Comes Up With ,your Tank Is A 80 Gallon
My Tank Is A 60 Gallon And My Tank Is 48 1/2 By 15 1/2 By 17 And It Comes Up With 53 Gallons ............thats Weired....... Try It Your Self...